title: Minor products from the reaction of (+) and (-) benzo[a]-pyrene-anti-diolepoxide with DNA.
abstract: The reaction of trans-7,8-dihydroxy-anti-9,10-epoxy-7,8,9,10-tetrahydrobenzo[a]pyrene (BP-diolepoxide) with deoxyguanosine has been studied. In addition to the expected N2-guanine derivative minor products resulting from reaction at the O6 and 7-positions have been identified. Reaction of racemic, (+) or (-) BP-diolepoxide with [14C] and [3H]purine labelled DNA allowed these same products to be identified and their yields estimated. It was found that the O6 and 7-guanine products were derived mainly from reaction of the (-)isomer. The 7-substituted guanine derivative in DNA was unstable, undergoing either spontaneous release of the substituted guanine or imidazole ring opening.
mesh_terms: D015123:7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide; D001580:Benzopyrenes; D055598:Chemical Phenomena; D002621:Chemistry; D004247:DNA; D004269:DNA, Bacterial; D003849:Deoxyguanosine; D004926:Escherichia coli / Q000378:metabolism; D006868:Hydrolysis; D013237:Stereoisomerism
chemical_list: D001580:Benzopyrenes; D004269:DNA, Bacterial; D015123:7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide; D004247:DNA; D003849:Deoxyguanosine